Burglar alarm



Dec. 19, 1922. 1 1,439,152

M. C. DART.

BURGLAR ALARM FILED FEB. 7. I921 J- FEE;

Z5" 25 i l: i. 28 E i 1%. 4% "/577 3 By A TTORNEY Patented Dec. 19, 19221 Mamie. m or NEW YORK, N. Y.

j Beware ALARM.

Application 'filed February 7, 1921. Serial'ito. naasa To all w/wm itmay concern die it known that I, h lELviX-U. DART, a cltlzen of theUnitec Statesand a resident of New York cityyin thevco'unty and State ofNew York, have invented certain new and useful Improvements in a'Burglar Alarm, of which the following is a full, clear, and exactdescription;

Among the iprincipal objects which the present invention has in ,vleware'z to pro-i ride an alarm which is not sub ect tobeing tampered withbyaperson operating from the outsule ofthe door; to provide an alarmwhich operates continuously after the'doorf has been unoved nward fromits initial locked position; to provide a dead lockand alarm attachmentthereto to various working'conditions; to' p-rovide an alarm which I 1sr1g1dly attached to the bar 11, the end is easily transported anduniversally adjusted to doors and closure members of usual theeonstruc'tion of the alarm;

construction; and to simplify and cheapen I Drawings. I Figure 1 is ahorizontal section of a door and frame therefor showing a burglar'alarml mounted' thereon as in service thereto. 1

Figure 2 is a front view of the same showing fragments of the door andframe and the inner end of the alarm.

Figure 3 is a detailed view on enlarged scale showing an alarmconstructedand arranged in accordance with the present invention anddisposed as in service.

Figure 4- is a side view of the same.

Figure 5 is a detailed view on enlarged scale and in section the sectionbeing taken as on the line 55 in Figure 4.

Figure 6 is a modified form of the inven tion on a diminished scale forpermanent installation on the frame of a door.

. relation insertion within the bolt socket 13 g with.

which the door frame is usually provided. At the inner end as best seenin Fig. 4 of the drawings, the bar 11 is bifurcated by forming theopen-ended slots 14: therein.

The slot 14 forms a guide andrunwayfor a screw bolt 15 fixedly attachedto a plate 16 surround the edges of the bar 11. I

The plate 16 together with the clips-17 further provided with overturnedclips 1'? which and as will be seenin Fig. 4, partially and the bolt 15form a stop for a slidable locking member provided with a foot 18'tobeengaged by the door 19 whenthe same is moved to open position. Thelocking member has overturned edges 20 which guldesaid locking memberinits movement lengthwise" of the (bar 11. The foot 18 is reinforced andsupported by a brace 21' formed by an extension of the metal from whichthe said foot isformed, the free endiofthe brace inthe angle formed bythe bracketf.

resting It willbe seen that whenever theplateHlG thereofwith the clips17 limitthe movement of the locking member. ln practice the plate 16 andlocking member are drawn backso that thewhook 12" may be inserted 'inthesocket 13 prior to closing the door 19. The) *door 19 is thenclosedfforcing the hook 12 into the socket 13 to hold thepsam'e therein.1

The locking member is then moved forward until the foot 18 pressesslightly on the mner side of the door 19. The plate 161s if it'isdesired to form a deadlock for the door, the plate 16 is moved; until itengages holding theplate 16 stationary on the bar 11. That shown in thedrawings is to provide a series of forwardly inclined teeth 23 whichslides o'n the bar 11. The plate 16 is with which corresponding teethformed in V a washer 2 l fit. The washer 24 is slidably mounted onthe'bolt 15 and is pressed into engagement with the bar 11 and the teeth23 thereof by the wing nut 25,the threads of which engage the threads onthe bolt 15.

The alarm bell 26 is made in any suitable manner. That shown in thedrawings 1s mechanism which is'released by a plunger 27. The bell ismounted by means of a, bracket 28 on the plate 16, to which it ispermanently secured. The disposition of the bell 26 on the plate 16 issuch that the z a bell having a spring operated striking end of theplunger 27 protrudes slightly ahead of the end of the plate 16 and theclips 17 thereof. The plunger 27 is' disiio posed in the path of thebracket 22 and engages the same to be moved thereby to 85 movedforward-toward the lock member and release thespring actuated mechanismfor the" bell 26 prior to the body of the locking member engaging theplate 16 or the clips 17. Thus, in practice, when the alarmbell isemployed before the dead lock of the bar ward section is heldpermanently; on the xjli'rame of the door by means of screws 30 on othersuitable fasteningdevices.

a permitted, the inner end of the bar. carryinglthe :bell26 and lockingmember \may be swungout of the path of the door 19, the e alarm being ythen inactively disposed. \Vhen, however, it is desired to place thealarm in active position, the swinging portionof the bar 11 is moved tothe position shown in Fig.6 olthe drawings, and a hingedlabrace 81having a friction foot 32 ,Inade of rubber or other suitable material isswung on its hinge 33 by which itis connected to the clips 17 until'thefoot 32 engagesthe frame of the door.

dent that when the door 19 now presses against the foot 18 of thelocking member,

' the bar 11' is prevented from swinging on the hinge 29'by the brace 31and the =ioot 32 thereof.,

It is evident that alarm mechanism constructed and arranged inaccordance with When the present arrangement may be transported bysalesmen or other persons traveling, to temporarily installed inactive'position on a closed door so that a person in a hotel or othertemporary habitation may close the door and adjust the alarm thereto insuch a manner as to avoid the possibility vof opening, the door withoutfirst arousing him.

. Claim,

A burglar alarm comprising a continu ously operable fillCllblG alarmnormally restrained from. operating: a supporting bar for. saidalarm,saidbar having'at apprommately oneextremity, an ofi'set hookfor engaginga socket 111 a, standing structure, and a series of detent membersdisposed between the-extremities of said bar; .means i for mounting saidalarm on said'bar, said meansembodying a bracket'for said alarm slidablymountedonsaid bar, and an adjustable locking member mounted on saidbracket for "engaging-said detent members, and a manually operatedscrews member for clamping said bracket'on said bar; and a "bracketslidably mounted on saidbar for It is evi-- releasing said alarm whensaid bracket is .moved toward said alarmysaid bracket being arresteditsmovement by the sup porting bracketof said alarm for prevente ing theentrance opening of a door or window member operatlvely engaged withsaid alarm. 1 v r i.

MELVIN C, DART,

